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Thioesterase Superfamily Member 1 Undergoes Stimulus-Coupled Conformational Reorganization to Regulate Metabolism in Mice

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Thioesterase Superfamily Member 1 Undergoes Stimulus-Coupled Conformational Reorganization to Regulate Metabolism in Mice ARTICLE https://doi.org/10.1038/s41467-021-23595-x OPEN Thioesterase superfamily member 1 undergoes stimulus-coupled conformational reorganization to regulate metabolism in mice Yue Li 1,2, Norihiro Imai3, Hayley T. Nicholls 3, Blaine R. Roberts 4, Samaksh Goyal 1,2, Tibor I. Krisko 3, Lay-Hong Ang 1,2, Matthew C. Tillman4, Anne M. Roberts4, Mahnoor Baqai 1,2, Eric A. Ortlund 4, ✉ ✉ David E. Cohen 3 & Susan J. Hagen 1,2 1234567890():,; In brown adipose tissue, thermogenesis is suppressed by thioesterase superfamily member 1 (Them1), a long chain fatty acyl-CoA thioesterase. Them1 is highly upregulated by cold ambient temperature, where it reduces fatty acid availability and limits thermogenesis. Here, we show that Them1 regulates metabolism by undergoing conformational changes in response to β-adrenergic stimulation that alter Them1 intracellular distribution. Them1 forms metabolically active puncta near lipid droplets and mitochondria. Upon stimulation, Them1 is phosphorylated at the N-terminus, inhibiting puncta formation and activity and resulting in a diffuse intracellular localization. We show by correlative light and electron microscopy that Them1 puncta are biomolecular condensates that are inhibited by phosphorylation. Thus, Them1 forms intracellular biomolecular condensates that limit fatty acid oxidation and sup- press thermogenesis. During a period of energy demand, the condensates are disrupted by phosphorylation to allow for maximal thermogenesis. The stimulus-coupled reorganization of Them1 provides fine-tuning of thermogenesis and energy expenditure. 1 Division of General Surgery, Department of Surgery, Beth Israel Deaconess Medical Center, Boston, MA, USA. 2 Department of Surgery, Harvard Medical School, Boston, MA, USA. 3 Division of Gastroenterology and Hepatology, Department of Medicine, Weill Cornell Medical College, New York, NY, USA. ✉ 4 Department of Biochemistry, Emory University, Atlanta, GA, USA. email: [email protected]; [email protected] NATURE COMMUNICATIONS | (2021) 12:3493 | https://doi.org/10.1038/s41467-021-23595-x | www.nature.com/naturecommunications 1 ARTICLE NATURE COMMUNICATIONS | https://doi.org/10.1038/s41467-021-23595-x ntracellular triglycerides are stored within lipid droplets (LD) Them1 is comprised of tandem N-terminal thioesterase Ithat are juxtaposed to mitochondria in the cytoplasm1. This domains and a C-terminal lipid-binding steroidogenic acute close relationship facilitates the rapid transfer of fatty acids to regulatory-related lipid transfer (START) domain. Proteomics mitochondria, which are generated by lipolysis in response to has revealed that there are a number of BAT-selective phos- cellular energy demands2. One such demand is non-shivering phorylation sites near the N-terminus of Them1 in vivo, most thermogenesis, which is mediated by brown adipose tissue (BAT) notable are serine residues at (S) 15, 18, and 2512. Here, we show in response to cold exposure to generate heat3. This occurs, at experimentally that Them1 is phosphorylated at the N-terminus least in part, when mitochondrial β-oxidation is uncoupled from after stimulation in vitro and exists in two different oxidative phosphorylation via uncoupling protein 1. The hydro- phosphorylation-dependent conformational states: punctate and lysis of LD-derived triglycerides is initiated following the release diffuse. Punctate refers to small, highly concentrated aggregations of norepinephrine from neurons, which binds to β3 adrenergic of Them1 that localize to regions of the cytoplasm that interface receptors on brown adipocytes to stimulate a cell signaling cas- with LD and mitochondria, whereas diffuse refers to homo- cade that activates adenylyl cyclase to generate cAMP and activate geneously distributed Them1 across the cell cytoplasm and protein kinase A (PKA)4. In brown adipocytes, the generation of nucleus. We demonstrate that β-adrenergic stimulation with NE, fatty acids for mitochondrial oxidation requires PKA to phos- which is used to mimic cold exposure, activates a signaling cas- phorylate/activate perilipin, a regulatory membrane-bound pro- cade that results in Them1 phosphorylation and a diffuse loca- tein that encircles LD. The function of perilipin is to protect lization. A functional analysis revealed that Them1 in punctate triglycerides within the LD from lipolysis, and its phosphoryla- form suppresses fatty acid oxidation, whereas this suppression is tion by PKA allows access of cytoplasmic adipose triglyceride abrogated when it is diffusely distributed in the cell cytoplasm. lipase (ATGL), hormone-sensitive lipase (HSL), and mono- Overall, these findings highlight the importance of Them1 acylglycerol lipase (MAGL), to generate free fatty acids through phosphorylation in the regulation of thermogenesis in BAT and sequential lipolytic steps5. Once fatty acids are free in the cyto- lend support for targeting Them1 for the management of obesity- plasm, they are esterified with coenzyme A (CoA) by long-chain related disorders. acyl-CoA synthetase 1 (ACSL1) to form fatty acyl-CoAs, which are transported into mitochondria via carnitine palmitoyl trans- Results ferase 1 and metabolized to produce heat6. Fatty acyl-CoA N-terminal serine phosphorylation of Them1. To assess the molecules can also be hydrolyzed to fatty acids in the cytoplasm BAT-selective phosphorylation of Them1, we consulted the by acyl-CoA thioesterase (Acot) isoforms7,8. The fatty acids phosphomouse database12, which revealed phosphopeptides generated can be utilized to make additional fatty acyl-CoAs that containing phosphorylation events at serine (S) 15, 18, and 25 in are transported into mitochondria or can be returned to the LD the N-terminus of Them1 in vivo within BAT, which are highly for storage. conserved (Supplementary Fig. 1). Thioesterase superfamily member 1 (Them1), which is also To explore the role of Them1 S-phosphorylation in regulating known as brown fat inducible thioesterase or steroidogenic acute metabolism, cultured immortalized brown adipose cells (iBAs) regulatory protein-related lipid transfer (START) domain 14 from mouse BAT were used as an in vitro model. Because iBAs (StarD14)/Acot11, plays an important role in energy did not express Them1 mRNA or protein, as was the case for homeostasis9,10. Mice with the genetic deletion of Them1 exhibit primary cultured brown adipocytes11, Them1 expression required increased energy expenditure, which results in reduced weight plasmid or adenoviral transfection (Supplementary Fig. 2a–c) to gain when challenged with a high fat diet despite high food study its biochemical and physiological characteristics in vitro. To consumption10. This is attributable to increased mitochondrial examine whether Them1 is S-phosphorylated after stimulation, fatty acid oxidation, and mechanistic studies have demonstrated we determined the aggregate abundance of phosphopeptides that Them1 functions to suppress energy expenditure by limiting in the N-terminus of Them1 by mass spectrometry after stimulation triglyceride hydrolysis in BAT, thus inhibiting the mitochondrial with phorbol 12-myristate 13-acetate (PMA; Fig. 1a, b) normalized oxidation of LD-derived fatty acids10,11. to hormone-sensitive lipase as a housekeeping phosphopeptide Fig. 1 Regulation of Them1 phosphorylation and its subcellular localization in iBAs. a LC-MS/MS data for iBAs expressing Ad-Them1-EGFP stimulated with PMA for 0–4 h. The data are presented as normalized aggregate abundance of N-terminal phosphopeptides using hormore sensitive lipase as a reference for normalization, which does not change after PMA stimulation (see Supplementary Fig. 3). Regression line indicates a positive and significant correlation between phosphorylation events at the N-terminus and time after stimulation. Data are means ± SE for n = 3 different experiments/timepoint. Statistical significance was determined by ANOVA on the regression line, where P < 0.001. Normality test passed (P = 0.759) and constant variance test, via Spearman Rank Correlation, passed (P = 0.460). b Schematic diagram of the experimental design in a. c N-terminal amino acid sequence of Them1 showing specific phosphorylation events at S25, S27, and S31 in the Them1 sequence (blue asterisks) as determined by LC-MS/MS. Phosphorylation events in vivo at S15, S18, and S25 are represented by red font. 2 NATURE COMMUNICATIONS | (2021) 12:3493 | https://doi.org/10.1038/s41467-021-23595-x | www.nature.com/naturecommunications NATURE COMMUNICATIONS | https://doi.org/10.1038/s41467-021-23595-x ARTICLE that does not change with PMA stimulation (Supplementary not attributable to the synthesis of new Them1-EGFP protein, Fig. 3). This resulted in a linear increase in phosphorylation because inhibition of protein synthesis using cycloheximide events over time after stimulation (Fig. 1a), with serine during the 4 h period of stimulation had no effect on Them1 phosphorylation events that could be measured at S25, S27, localization or protein concentration (Supplementary Fig. 7). and S31 (Fig. 1c). Taken together, these in vivo and in vitro The canonical PKC binding sequence, R/K-X-S-X-R/K where results suggested that stimulus-mediated S-phosphorylation Xat+1 is a hydrophobic residue, is not present within the N- within the N-terminus could control Them1 metabolic activity terminal Them1 sequence (Fig. 1c). However, our pathway in BAT. suggested that PKC was involved in the dissolution of puncta. To examine this experimentally, we used an antibody specific for the canonical PKC binding
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